检查字符串，要求必须包含数字和字母
代码 // ----------------------------------------------------------------------------------------------------- int AllNum( char * str){ int i,nLen; nLen = strlen(str); for (i = 0 ;i < nLen;i ++ ) { if (isalnum(str[i]) == 0 ) return ( 0 ); } return ( 1 );} // ----------------------------------------------------------------------------------------------------- int AllDigit( char * str){ int i,nLen; nLen = strlen(str); for (i = 0 ;i < nLen;i ++ ) { if (str[i] < ' 0 ' || str[i] > ' 9 ' ) return ( 0 ); } return ( 1 );} // ----------------------------------------------------------------------------------------------------- int AllPha( char * str){ int i,nLen; nLen = strlen(str); for (i = 0 ;i < nLen;i ++ ) { if (isalpha(str[i]) == 0 ) return ( 0 ); } return ( 1 );} // ------int CheckBarcode(char *szBarcode)------------------------------------------------------------------------------ int CheckBarcode( char * szBarcode){ int nLen; nLen = strlen(szBarcode); if (nLen < 2 || nLen > 13 ) return 0 ; if (AllNum(szBarcode)) // 只有数字或字母，没有其他符号 { if (AllPha(szBarcode)) // 纯字母 return 0 ; else if (AllDigit(szBarcode)) // 纯数字 return 0 ; else return 1 ; } else { return 0 ; }}